KR101937329B1 - sheet-clad steel and steel tube utiling the same and apparatus for manufacturing thereof - Google Patents

Abstract

The present invention discloses a clad steel plate, a steel pipe using the same, and an apparatus for manufacturing the clad steel plate. The clad steel sheet of the present invention comprises a base steel sheet member, a coated steel sheet member that is coated on at least one side of the base steel sheet member, and a joint metal on at least one side of the bonded surface of the base steel sheet member, And a spray coating bonding layer for spraying the sprayed coating layer and for bonding the base steel sheet member and the coated steel sheet member by pressing the base steel sheet and the coated steel sheet.
The apparatus for manufacturing a clad steel plate includes a base steel plate member supply unit for supplying a base steel plate member to be unwound from a coil, a coated steel plate member supply unit provided on at least one side of the base steel plate member for continuously supplying a coated steel plate member, A rolling joining unit having a first and second rolling rolls for joining a base steel sheet member supplied from a supply unit and a coated steel sheet member adhering to the upper or lower surface of the base steel sheet member; And a bonded metal spraying unit for spraying the bonded metal onto the bonded surface of the coated steel sheet member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clad steel plate and a manufacturing method of the steel plate and the clad steel plate using the same,

The present invention relates to a clad steel plate and a manufacturing apparatus for a steel pipe and a clad steel plate using the same, and more particularly, to a clad steel plate which is manufactured by spraying a joining metal on two joining surfaces where a base steel plate member and a coated steel plate member are laminated, A steel pipe using the same, and an apparatus for manufacturing the clad steel sheet.

delete

In general, the clad steel sheet is formed by atomic diffusion bonding after pressing other kinds of steel or metal such as nickel, nickel alloy, stainless steel, iron, brass, aluminum and zinc alloy. Unlike conventional clad, these clad steel sheets are rolled together by superposing them on the surface of another metal plate. The production of high-cost materials such as stainless steel and titanium by pressing them on the base material is a cost-saving effect and has good corrosion resistance, which is leading to an increase in demand for clad steel sheets both at home and abroad.

Such a clad steel sheet is used in various tanks, heat exchangers, steel pipes, etc. In cold-rolled clad steel sheets, annealing heat treatment is performed to remove stress. When annealing is not sufficiently performed, cracks are generated. It can not be molded into a part of a shape. Further, if the heat treatment is performed at a too high temperature or for a long time, there is a problem that excessive oxidation and grain growth occur.

Korean Patent Laid-Open Publication No. 10-1998-0051094 discloses a method in which a copper layer having a high heat transfer coefficient is coated on the surface of a centrifugally cast roll, a stainless steel layer having a low heat transfer characteristic is formed on the copper- There is disclosed a surface coating method of a husk roll in which any one of chromium carbide and cobalt based alloy is coated on a spray-coated stainless steel layer.

Japanese Patent Application Laid-Open No. 2004-249367 discloses an austenitic stainless steel plate, a magnetic iron or iron alloy plate coated with aluminum, an aluminum or aluminum alloy plate, and an austenitic stainless steel plate sequentially laminated and bonded , And an aluminum / stainless steel clad plate. Korean Patent No. 100365646 discloses a corrosion-resistant clad steel sheet and a manufacturing method thereof. The posted clad steel plate has a structure in which a corrosion resistant metal plate is bonded to one side or both sides of a carbon steel plate and a thin plate strip of an amorphous alloy mainly composed of iron is welded between the carbon steel plate and the corrosion resistant metal plate as a first binder.

Korean Patent Registration No. 10-1431240 discloses a method for producing a clad steel sheet using a welding material composition. A method of manufacturing a clad steel plate, comprising: a welding material application step of applying a welding compound composition, which is a mixture of metal powder and borax mixed on the entire upper surface of a first metal plate among a plurality of metal plates having different properties; A lamination step of forming a laminate by bringing the upper surface of the first metal plate and the lower surface of the second metal plate into contact with each other; And a joining step of welding the first metal plate and the second metal plate by welding the laminated plate.

In the conventional clad steel sheet as described above, when a metal plate is manufactured by joining, a large amount of work is required for joining the metals. Particularly, when a surface layer is formed by spraying a metal surface on a plate, the surface roughness is not relatively high, and corrosion resistance and corrosion resistance are relatively low. In addition, the clad plates coated or bonded with stainless steel have very low practicality due to the inconvenient problems such as steel pipe manufacturing, various shapes of steel or joint structures using such basic coating technology.

Korean Patent Registration No. 10-1431240 Japanese Patent Application Laid-Open No. 2004-249367 Korean Patent No. 100365646

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to reduce the defective bonding between the base steel sheet member and the coated steel sheet member, to increase the bonding strength by determining the thickness regardless of the material of the base steel sheet member and the coated steel sheet member, And it is also an object of the present invention to provide a clad steel sheet which does not require post-processing such as surface polishing and whose inherent tensile strength and the like of the base steel plate member and the coated steel plate member remain unchanged after bonding and a steel pipe using the same.

Another object of the present invention is to provide an apparatus for producing a clad steel sheet capable of continuous production and improving productivity.

The present invention is characterized in that a spray coating layer is first formed on a joint surface of a base steel plate member made of iron and a joint surface of a coated steel sheet member made of a selected material to adjust the surface roughness for activating the joint and the joint surface of the base steel sheet member and the coated steel sheet member A clad steel plate having a variety of functional coated steel plate members, a steel pipe using the clad steel plate, and an apparatus for manufacturing the clad steel plate.

According to another aspect of the present invention, there is provided a clad steel sheet comprising a base steel sheet member made of a coil, a coated steel sheet member made of a coil coated on at least one side of the base steel sheet member, And a sprayed joint metal layer for joining the base steel sheet member and the coated steel sheet member to each other by welding a joint metal to the joint surface of the coated steel sheet member.

In the present invention, the joining auxiliary thermal spray coating layer may be further provided on at least one side of the joining surface of the base steel sheet member and the coated steel sheet member to be sprayed before joining by the spray joining metal layer to activate the joining.

In the present invention, the base steel sheet member is made of iron or an iron alloy, and the coated steel sheet member is made of one selected from stainless steel, a stainless steel alloy, aluminum, an aluminum alloy, a copper alloy and titanium, , Stainless steel alloy, aluminum, copper ferrous metal

Wherein the thermal spray bonding layer comprises a first thermal spray bonding metal layer sprayed on the bonding surface of the base metal sheet member, a second thermal spray bonding metal layer sprayed on the bonding surface of the coated steel sheet member, and a second thermal spray bonding metal layer between the first thermal spray coating layer and the second thermal spray bonding layer And at least one third spray bonding metal layer for bonding and bonding the first and second spray bonding layers to be positioned.

The material of the third thermal spray bonding metal layer may be made of a material that is relatively stronger than that of the first or second thermal spray coating layer, or a material of a weaker material. The material forming the first and second thermal spray bonding layers may be a mixture of at least two metals selected from stainless steel, a stainless steel alloy, aluminum, and copper.

The material of the thermal spray bonding metal layer formed on at least one side of the bonding surface of the base metal sheet member or the bonding surface of the coated steel sheet member may be a metal mixed with at least one of stainless steel, a stainless steel alloy, aluminum, an aluminum alloy, .

The base steel sheet member is formed by spraying a joint metal of first and second base steel sheet members made of a cold coil or a hot-rolled steel sheet coil, and is successively joined by a thermal spray bonding metal layer.

According to an aspect of the present invention, there is provided a steel pipe using a clad steel sheet according to the present invention, comprising: a base steel sheet member having a tubular body portion formed by joining both ends in a longitudinal direction thereof; And a joining metal is sprayed on the joining surface of at least one selected side of the base steel plate member and the joining surface of the coated steel plate member so that the base steel plate member and the coated steel plate member are co- And a thermal sprayed metal layer for joining the thermal sprayed metal layer.

The width of the coated steel sheet member joined to the base steel sheet member can be formed to be relatively larger than that of the base steel sheet member. This is because the both end portions of the coated steel sheet member are made of a clad steel sheet coil protruding from the end portion of the base steel sheet member, and when the clad steel tube is produced by the production of the electrosealing tube, both side projections are touched, It has advantages in the process.

According to another aspect of the present invention, there is provided an apparatus for manufacturing a clad steel sheet, comprising: a base steel sheet member supply unit for supplying a base steel sheet member to be unwound from a coil; A sheet material feeding unit for feeding sheet material,

A rolling joining unit having a first and second rolling rolls for joining a base steel sheet member fed from the base steel sheet feeding unit and a coated steel sheet member adhering to the upper or lower surface of the base steel sheet member,

And a joint metal spraying unit for spraying the joint metal on the joint surface of the base steel sheet member and the joint surface of the coated steel sheet member supplied to the rolling joint unit.

In the present invention, the bonded metal spraying unit is provided on the front surface side of the first and second rolling rolls of the rolling joining unit, and a first joint for spraying the joint metal on the joint surface of the base steel plate member and the joint steel plate member, Includes metal events.

The joint metal thermal spraying unit may include a second joint metal event disposed adjacent to the first joint metal event to spray a bonding metal onto the surface of the base steel sheet member,

And a third joint metal event disposed adjacent to the first joint metal event to spray the joint spray metal onto the surface of the coated steel sheet member. At least one of the events for the first, second, and third joint metals may be alternately installed with the first and second unit joint metal events for spraying different spray joint metals.

      In the present invention, the clad steel sheet flattening unit for flattening the bonded clad steel sheet is further provided at the rear portion of the rolling joining unit.

The effects of the clad steel sheet according to the present invention and the steel pipe and clad steel sheet manufacturing apparatus using the same are as follows.

The clad steel sheet according to the present invention can increase the bonding strength between the base steel sheet member and the coated steel sheet member and can manufacture various functional steel sheets.

Further, the clad steel sheet can maintain the excellent inherent physical properties of the coated steel sheet members such as steel and stainless steel sheet, aluminum steel sheet and copper steel sheet, and can effectively manufacture a steel pipe excellent in tensile strength, corrosion resistance and abrasion resistance.

Further, the apparatus for producing a clad steel sheet is capable of continuously producing a clad sheet, reducing the production cost of the clad sheet, and further improving the productivity.

1 is a perspective view of a clad steel sheet according to the present invention,
2 is a sectional view of a base steel sheet member of a clad steel sheet according to the present invention,
3 is a perspective view showing another embodiment of the clad sheet according to the present invention,
4 to 6 are perspective views showing another embodiment of the clad sheet according to the present invention.
7 is a perspective view of a clad steel pipe using the clad steel sheet according to the present invention,
8 is a partially cutaway perspective view showing another embodiment of the clad steel pipe according to the present invention,
9 is a sectional view of a steel pipe using a clad steel sheet according to the present invention,
10 is a view showing a clad steel sheet manufacturing apparatus according to the present invention,
11 is an enlarged view showing the base steel plate member supply unit shown in Fig. 10,
Fig. 12 is an enlarged view of the cover steel sheet supply unit shown in Fig. 10,
FIG. 13 is an excerpt of the bonded metal thermal spraying unit shown in FIG. 10,
14 is a view showing another embodiment of the bonded metal thermal spraying unit of the clad steel sheet producing apparatus according to the present invention,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clad steel plate, a steel pipe using the same, and an apparatus for manufacturing the clad steel plate. One embodiment of the clad steel plate is shown in Figs.

The clad steel sheet 10 according to the present invention includes a base steel sheet member 20, a cover steel sheet member 30 coated on at least one side of the base steel sheet member 20, ) And the joining surface (31) of the coated steel plate member (30) are sprayed so as to spray the warp sheet (20) and the coated steel plate member (30) And a bonding metal layer (40).

The thermal sprayed metal layer 40 is formed by joining the base steel sheet member 20 and the coated steel sheet member 30 such that the portion where the thermal sprayed metal layer 40 is joined at the same time as the formation of the thermal sprayed metal layer 40 is continuously rolled, The steel plate member is joined.

As described above, the base steel sheet member 20 of the clad steel sheet 10 of the present invention is made of iron or an iron alloy. The base steel plate member 20 may be formed by joining the cold-rolled steel coil 25 or 25 or the hot-rolled steel coil with the thermal sprayed joining layer 26 as shown in FIG. Here, the thermal spray bonding layer is formed by spraying an iron or iron alloy, which is a bonding metal.

The coated steel plate member 30 may be formed of one selected from stainless steel, a stainless steel alloy, aluminum, an aluminum alloy, a copper alloy, titanium, and a nonferrous metal. However, the coated steel sheet member 30 is not limited to the above-described embodiments, and may be made of metal of various materials depending on applications of the corrosion-resistant, wear-resistant, corrosion-resistant clad steel sheet.

The base steel sheet member 20 made of iron or an iron alloy preferably has a thickness of 1-50 mm, more preferably 1-20 mm. When the coated steel plate member 30 is made of a stainless steel plate, the stainless steel plate is austenitic stainless steel having STS 316 (1371 ° C. to 1399 ° C.), stainless steel made of 18 wt% of chromium and 8 wt% of nickel, or 303 STS (1399 ° C to 1421 ° C), 304 STS (1399 ° C to 1454 ° C), and the like.

Thickness of the coated steel plate member 30 may vary depending on the material, but it is preferable that the thickness is 0.3 to 2 mm.

The material of the joining metal constituting the sprayed joint metal layer 40 may be at least one selected from the group consisting of stainless steel, stainless steel alloy, carbon steel, aluminum, copper, iron, iron alloy and nonferrous metal.

The thermal sprayed metal layer 40 is formed by forming a first sprayed metal layer 41 on which a bonding metal is sprayed on the bonding surface 21 of the base steel sheet member 20 as shown in FIG. A second sprayed metal layer 42 formed by spraying a bonding metal may be formed. The surface roughness of the first and second sprayed metal layers 41 and 42 can be controlled by the third thermal spray bonding metal layer 43 so that the bonding between the base steel sheet member 20 and the coated steel sheet member 30 can be smoothly performed. And the binding force by the third spraying metal layer 43 can be increased.

The third spraying metal layer 40 is preferably made of a material having relatively stronger or weaker strength of the bonding metal than the bonding metal forming the first and second sprayed metal layers 41 and 42.

The first and second sprayed metal layers 41 and 42 and the third sprayed metal layer 43 may be formed of a single sprayed metal layer made of a single joint metal or two or more joint metals selected from the joint metal And a composite sprayed metal layer. The single sprayed metal layer and the composite sprayed metal layer should be formed regularly and continuously.

As shown in FIG. 4, the sprayed metal layer 40 may have two or more regions where different bonding metals are continuous and uniformly formed in the longitudinal direction. That is, at least one thermal sprayed metal layer 40 selected from among the thermal sprayed metal layers 40 has two or more single metal sprayed metal layer regions 44 and at least one composite sprayed metal layer region 45 made of another metal. And the single sprayed metal layer region 44 is preferably present in the outermost region of the base steel plate member 20 or the coated steel plate member 30. [

On the other hand, as described above, in the structure of the clad steel plate 10, as shown in Fig. 1, the base steel sheet member 20 is made of iron or an iron alloy, and the material of the coated steel sheet 30 bonded thereto is stainless steel Or a stainless steel alloy, stainless steel or a stainless steel alloy and a metal selected from the group consisting of iron and iron alloys, for example, stainless steel metal are sprayed on the joint surfaces 21 and 31 to form a single sprayed joint metal layer, So that a composite sprayed metal bonding layer can be formed.

As shown in FIG. 5, the clad sheet metal member 40 for joining the base steel sheet member 20 and the coated steel sheet member 30 is made of a base steel sheet member 20 and a covered steel sheet member 30, A first thermal sprayed metal layer region 46 in which a single metal is sprayed on the both ends in the longitudinal direction of the first thermal sprayed metal layer 30 and a second thermal sprayed metal layer region 45 formed by spraying a plurality of bonding metals in the middle portion thereof, Lt; / RTI >

In this embodiment, the metal constituting the first thermal sprayed metal layer region 46 formed by spraying the single metal is made of stainless steel or a stainless alloy, and the second thermal sprayed metal layer region 47, which is a composite thermal sprayed layer, A metal made of iron, aluminum or a mixture of iron and aluminum, preferably one or more metals selected from aluminum and non-ferrous metals, may be sprayed.

6 shows another embodiment of the clad sheet. Referring to the drawings, a clad steel sheet 10 is made of a first and second spray joint metal layers 48 (see FIG. 1) formed on a joint surface of a base metal member 20 made of iron and an iron alloy and a coated steel sheet member 30 made of stainless steel or a stainless steel alloy (49). The thermal spray bonding metal layer 40 is formed such that the first and second thermal spray bonding metal layers 48 and 49 formed on the bonding surface of the base metal sheet member 20 and the bonding surface of the coated steel sheet member 30 are made of a single metal The sprayed metal layer and the composite sprayed metal layer may be sprayed or alternately stacked.

In the above-described embodiment, it is preferable that the thickness of the thermal spray bonded metal layer 40 is 10 μm to 500 μm. If the thickness is less than 10 탆 or exceeds 300 탆, unevenness of the layer thickness may occur and the bonding force between the base steel plate member 20 and the coated steel plate member 30 may be relatively decreased. More preferably, the thickness is 100 mu m to 300 mu m, which is most advantageous in terms of maximizing the bonding force between the base steel sheet member 20 and the coated steel sheet member 30 to be clad-bonded.

One embodiment of a steel pipe using the clad steel sheet constructed as described above is shown in Figs. 7 to 9. Fig. In these embodiments, the same reference numerals as in the above-mentioned embodiments indicate the same components.

Referring to the drawings, a steel pipe 50 using a clad steel plate comprises a base steel plate member 20 and a cover steel plate member 30 coated on at least one side of the inner or outer circumferential surface of the base steel plate member 20, And a body portion 51 formed by bending a clad steel sheet joined by a sprayed joint metal layer 40 sprayed on the surface thereof and then joining both ends thereof. The above-described clad steel sheet has been described in detail in the above-mentioned embodiment, and will not be described again.

In the steel pipe 50 using the above-described clad steel plate, the coated steel plate member 30 positioned inside and outside the tubular main body portion 51 and the both end portions of the base steel plate member 20 are welded, that is, So that the base steel plate member 20 is not exposed.

As shown in Figs. 8 and 9, the cross-sectional area exposed at both side ends of the steel pipe is a protruded coated steel plate portion 35 in which the coated steel plate member 30 protrudes from the parent steel plate member 20 in the outward direction So that they can be covered by folding and joining. The end portion of the main body portion 51 of the steel pipe 50 and the outer end portion of the projecting steel plate member 35 can be welded together. However, the bent surface and the welding are not limited thereto.

The method for producing a clad steel pipe using the clad steel sheet produced as described above includes the steps of preparing a clad steel sheet by spraying a sprayed metal member on the surface of the base metal sheet member 20 by rolling and brazing, ; Continuously forming an open tube in a cylindrical shape so that both ends of the clad steel plate are in contact with each other while forming the clad steel plate in a cylindrical tube shape; Forming a steel pipe main body portion by continuously welding the welded portion of the open pipe by high frequency welding; And rolling the welded portion welded by high frequency to continuously roll the welded projections so as to be flush with the inner and outer surfaces of the steel pipe.

The clad steel pipe manufacturing method using the clad steel sheet will be described in more detail as follows.

First, in order to manufacture a steel pipe using the clad steel sheet, the flattened steel sheet is loosened by a step of loosening the clad steel sheet from the coil and driving the steel sheet to the next step, Can enter.

In addition, the present invention includes a step of forming a cylindrical open pipe so that both ends of the clad steel plate are in contact with each other while forming a cylindrical steel pipe shape using a pipe making device. The steel sheet entering the tube forming apparatus for forming the cylindrical open tube is passed through a plurality of step forming rolls having step forming rolls, reduction gears, and rotational power, etc., provided in the tube making apparatus, Lt; / RTI > In a gas room of semi-hermetically-shaped rectangular shape with a certain length in the pipe making machine, the beautifully welded cylindrical steel pipe which has been passed through the shear opening is subjected to a high-frequency preheating step or is immediately followed by high frequency welding, The steel pipe may be manufactured as a cylindrical steel pipe while continuing through the gas room rear room opening. In the cylindrical steel pipe produced by the high frequency welding, the rolling progresses at the inner and outer projecting portions generated during the high frequency welding by the rolling device including the rolling roll at a position of a certain distance from the high frequency welding portion.

In addition, the continuously manufactured cylindrical pipe may be further roughened by a step of adjusting the pipe to a rounded shape. In such a steel pipe straightening step, a process may be additionally carried out in which the steel is cooled by passing through a roll of a molding step and then cut by a cutter with a predetermined dimension. According to the present invention, such a process for producing a clad pipe can be carried out in a continuous process.

After the cylindrical open pipe is formed as described above, it is further possible to locally preheat the welds at both ends of the cylindrical open pipe to a high frequency before the high frequency welding. Preheating in the high frequency preheating step can be carried out at 300 ° C. to 900 ° C. This high frequency preheating step is performed before the welding of the both ends of the cylindrical open tube made using the clad steel plate, As a process, when a continuous process is performed while passing through a gas room while passing through a tubular pipe forming apparatus, a welding portion where both ends of a cylindrical open pipe are connected by a high frequency heater is preheated in a section immediately before welding in the gas room Step. The high-frequency preheating step includes, for example, a high-frequency generating device that generates and generates high-frequency power by controlling the applied power, a high-frequency preheating device such as a coil for heating both ends of the cylindrical open- . ≪ / RTI >

In the high frequency preheating step, a high frequency heating coil may be used, and a coil may be continuously provided at a portion of the tip end of the cylindrical open tube that is in contact with the welding tip. In case of preheating at a high heating temperature, a gas flow phenomenon is installed in the heating part and the rear end thereof or both of them to spray the preheating part of the cylindrical open end of the tube to prevent oxidation so as to prevent oxidation Gas injection can be applied. However, if preheating at low heating temperatures, this gas injection may not be applied. The high-frequency pre-heating step is a step that can be performed additionally as a method for advancing the high-frequency welding excellent in the high-frequency welding.

The clad steel sheet used for manufacturing the cylindrical steel pipe and the metal constituting the steel sheet are characterized in that stainless steel having a welding melting point of 1420 ° C to 1450 ° C is clad on the inner and outer sides and a welded melting point of 1450 The welding temperature of the steel is in the range of 5 ° C to 1550 ° C. Therefore, there is a difference in welding melting point depending on each metal material when high-frequency welding is applied to the dissimilar metal material. The high-frequency welding step of locally preheating a heterogeneous metal having such characteristics using a high-frequency preheating device including a coil, so that the welding melting point is made to be at the same time point between the clodially dissimilar metals in the subsequent process step, And it is a way to dramatically increase production. For example, stainless steel (0.3 mm to 2 mm) is used for the inner side, steel (2.3 mm to 25 mm) is used for the inner side, and stainless steel It is difficult to weld the tip end of the cylindrical open pipe because the difference in weld melting point is large when high-frequency welding is performed when the sprayed layer is multilayered with steel (0.5 mm to 2 mm) or the intermediate layer steel is thicker. In the present invention, a clad steel pipe having such a heterogeneous multi-layered metal and multiple layers is locally preheated by using a high-frequency preheating apparatus including a coil, and the welding melting point is the same among the clad- And it is a method that can remarkably increase the production amount by making the melting and calcining between each metal at the time of welding excellent. However, high frequency preheating may not be applied when the size of the clad pipe is ㅨ 27.2 ~ ㅨ 76.3 which is relatively small and the thickness of the steel plate as the middle layer is within 2 ~ 5㎜.

In the case of the clad steel pipe material of the present invention, the inside is made of stainless steel (0.3 mm to 1 mm) and the outside is made of a bonding layer sprayed with steel or the like, and the clad joint layer is two- , And when the thickness of the outer metal layer clad stainless steel is 5 mm or less, high frequency preheating may not be used.

And then welding the welded portions of both ends of the preheated or unheated open pipe to each other by high frequency welding to form a steel pipe. In the high-frequency welding step, the principle described in the high-frequency principle and the principle of heating proposed by the high-frequency preheating method using a coil are intensively induction-heated to the welded portion of the clad steel pipe to achieve welding at a temperature higher than other portions, Lt; / RTI > Further, in the high frequency welding step of the present invention, a gas injection device for preventing oxidation at the welding and a rolling device including a rolling roll for rolling the welding part protruding inward and outward at the time of welding are connected to each other, A rolling roll may be constructed so as to be compared with the inside and outside of the steel pipe of the steel pipe and subjected to the rolling step.

At this time, the cooling means for cooling the heat generated in the ferrite core can be constituted by circulating the cooling water. In the high frequency welding step, an oxidation prevention process may be further applied. In the anti-oxidation method of the present invention, the melting points of the metal materials to be welded in the high-frequency welding step for manufacturing the stainless steel clad cylindrical pipe are inner stainless steel (1420 ° C. to 1450 ° C.) and interlayer steel (1450 ° C. to 1550 ° C. ) And outer stainless steel (1420 ° C ~ 1450 ° C) are different from each other, so that these metals are prevented from being oxidized by reacting with air during welding, thereby enabling smooth welding. In this antioxidative method, a semi-hermetically sealed gas room is formed of nitrogen, argon and other mixed gases, and a high frequency welding point is applied in the gas room. At least two gas injection holes formed at the rear end of the ferrite core- The gas jetting port is used to spray the gas continuously from the inside of the cylindrical steel pipe to the upper side in the direction of the welded portion during welding, and can be sprayed at about 2 kg / cm 2 to 10 kg / cm 2 to prevent the painting. At this time, the injected gas spreads evenly over the welded portion, thereby preventing oxidation.

And the remaining amount of gas can spread out to the left and right sides of the inner welding portion of the cylindrical steel pipe, and can escape from the gas room. In order to supply a certain amount of gas to the device for preventing oxidation, a nipple is connected to the shear nonmagnetic metal of the ferrite core, and through the inlet pipe, a metal pipe having a channel formed at the center of the ferrite core is passed So that the function of supplying the gas to the gas injection port located at the rear end of the ferrite core and injecting the gas can be continuously performed.

In the anti-oxidation method in the high-frequency welding step, in order to prevent oxidation of the outer side of the cylindrical steel pipe in which the coated steel plate member is clad, the gas mist case is provided in the outer high frequency welding portion of the steel pipe , The end of the case is fixed to a certain part of the gas room, and then nitrogen, argon or other mixed gas is supplied to the gas supply pipe nipple connected to the fixed part, and the welding part is welded at a high pressure of 2 kg / ㎠ to 10 kg / And the gas may be sprayed. At this time, the injected gas spreads evenly, thereby preventing oxidation. During this gas injection process, some gases can escape to the outside. According to the present invention, such an antioxidant method contributes to the continuous production of a stainless steel clad cylindrical steel pipe which is a coated steel sheet member having excellent corrosion resistance

 In the high-frequency welding step, at least two gas injection openings are provided in both the inner and outer parts of the steel pipe at the welded portion of the cylindrical open-end tip for welding, and the gas is sprayed to improve the excellent weldability between the metals, It is possible to further include applying gas injection as a method for prevention. In the present invention, after the welding is completed, the welded portion welded by the high-frequency welding is rolled, and the welding protrusion is rolled so as to be flush with the inner and outer surfaces of the steel pipe. In the high-frequency welding step, in order to smooth the welding projection portions inside and outside of the cylindrical steel pipe continuously during high-frequency welding, that is, the portions projected by welding, The roller unit positioned and the rolling roll located corresponding to the outside of the steel pipe can be used to roll the protruding portions protruding inward and outward to continuously perform molding in the same manner as the inner and outer surfaces.

The welded cylindrical steel pipe is, for example, a steel pipe in which a stainless steel plate is adhered to a steel plate with a clad sprayed joint metal on the inner side, the outer side or the inner and outer side, The part is stainless steel. Therefore, it is not possible to cut the stainless steel material of the protruded portion by any other method, so that it is preferable to perform the rolling in the same manner as described above. The gas injection hole fixed to the rear end portion of the ferrite core formed on the outside of the cylindrical steel pipe and the inner roll constructive body located inside the steel pipe are assembled into one by using the steel pipe rolling device having such a configuration And then rolled. The inner roll structure includes a small roll having a function of assembling the inner roll structure frame with the second pin and adjusting the upper and lower portions by linking the roll with the roll, And the small roll may be arranged so as to be capable of rolling on the weld projection in a shape comparable to the inner side upper cylindrical surface of the steel pipe. In this case, fine adjustment of the fine adjustment screw located on the upper side of the bent rod end including the small roll to the fine direction adjusts the link action of the fixed rod including the small roll, that is, the force of the lever, It can be operated to have a constant pressing force against the projection. In addition, the lower small roll is disposed symmetrically with the upper small roll, and has the same sectional shape as the cylindrical surface in the steel pipe and has a cross sectional area larger than that of the upper small roll and is assembled with the third pin at the center of the lower end of the inner roll structure frame, It can be assembled and configured to perform functions. The upper and lower small rolls in the steel pipe can be rolled together with two upper and lower rolling rolls provided corresponding to the vertical line on the outer side of the steel pipe to perform the rolling process with the function of forcibly pressing the upper surface of the welded portion of the cylindrical steel pipe. In addition, an induction roll, which prevents the inside small-sized roll structural body from being warped rightward and leftward in the inside of the steel pipe, is additionally laid horizontally in the horizontal state of the steel pipe so that the inside upper and lower small rolls can stably perform rolling on the welding protrusions continuously Lt; / RTI >

In the high-frequency welding post-rolling process, rolling is performed by means of a small roll and a rolling roll installed inside and outside the welded cylindrical steel pipe. In this case, when the high-frequency welding is continuously performed, the molten bead protruding surface of the welded portion generated at the inside and outside of the steel pipe is driven by a pressing force function which pushes out the rolling force to the outside of the steel pipe by using a small roll, An external rolling roll positioned outside the small roll is subjected to rolling by applying a rolling force in an inner direction of the steel pipe to perform a rolling process so that the welded portion protruding inward and outward of the cylindrical steel pipe is flush with the other surface Process can be performed. At this time, the weld bead protrusion formed on the inner and outer sides of the clad cylindrical steel pipe may have a very fine air layer at the firing portion thereof. However, in the rolling process as described above, rolling is performed at 500 to 800 ° C A cylindrical steel tube cladded with a corrosion resistant stainless steel can be continuously manufactured while rolling is performed so as to have an excellent weld joint fibrillating force at the welded bead surface. The cylindrical pipe manufactured through the rolling process as described above may be further roughened by a steel pipe adjusting step of calibrating the cylinder to a round shape in order to calibrate the deformed portion that may occur in the process such as rolling. In the steel pipe adjusting step, the steel sheet is cooled by passing through a roll of a molding step, and then, a process of cutting a predetermined standard and length can be further continuously performed.

The manufactured cylindrical steel pipe is cut and then further processed in a separate process line to cut both sides of the cylindrical steel pipe clad in which the stainless steel is clad and to extend the stainless steel layer to the end of the end face of the outer side of the cut face to extend the stainless steel inside the steel pipe, It is possible to finally manufacture a cylindrical steel pipe having a complete corrosion resistance function.

On the other hand, one embodiment of a manufacturing apparatus for manufacturing a clad steel sheet is shown in Figs. 10 to 14. Fig.

Referring to the drawings, an apparatus 100 for manufacturing a clad steel sheet according to the present invention includes a base steel plate member supply unit 200 for supplying a base steel plate member 20 to be unwound from a coil of a base steel plate member 20, A coated steel plate member supply unit 300 provided at least on one side of the base steel sheet supply unit 200 for continuously supplying the coated steel plate member 30 and the base steel plate member 20 supplied from the base steel plate supply unit 200, And a first and second rolling rolls 401 and 402 for joining a coated steel plate member 30 which is in close contact with the upper or lower surface of the rolling contact member 20. A joining metal spraying unit 500 for spraying a joining metal on the joining surface 21 of the base steel plate member 20 and the joining surface 31 of the coated steel plate member 30 to be supplied to the rolling joining unit 400 .

The clad steel sheet manufacturing apparatus 100 according to the present invention having the above-described structure will be described in detail as follows.

First, the base steel plate feeding unit 200 is for feeding the coil of the base steel plate member 20 wound by the coil to the first and second rolling rolls 401 and 402 of the rolling joining unit 400, A planarization unit 210 for flattening the base steel plate member 20 made of a steel plate or a cold rolled steel plate and a base steel plate member 20 which is uncoiled by the coil of the subsequent base steel plate member when the coiled base steel plate member 20 is loosened, And a welding unit (220) for welding the welding wire. A steel plate surface treatment unit 230 for treating the surface of the flattened base steel plate member 20 and a cleaning unit 230 for cleaning the base steel plate member 20 subjected to surface treatment by the steel plate surface treatment unit 230, (240).

The planarization unit 210 includes a plurality of upper rollers 212 and a lower rollers 211 mounted on the frame and installed to be in contact with the upper and lower surfaces of the base steel sheet member 20 to be fed back from the coils. The upper roller 212 and the lower roller 211 may be staggered or juxtaposed. However, it is preferable that the upper roller 212 is installed between the lower rollers 211. Although not shown in the drawings, at least one roller of the upper roller 212 or the lower roller 211 is elastically supported and can be driven by a separate motor.

The welding unit 220 can butt-weld the end portions of the supplied base steel plate members 20 and the base steel plate members 20 that are unwound from the new coils. The two base steel plate members 20 are fixed And a welding rod holder.

The surface treatment unit 230 is for removing foreign substances by impinging sanding particles on the upper and lower surfaces of the base material steel sheet member 20 and for forming projections and recesses on the surface of the base steel sheet member 20, The chamber 231 is provided with guide rollers 232 for continuously guiding the base material sheet member 20 from the inlet portion to the discharge port side. The chamber 231 is provided with an inlet portion and a discharge portion, do. A plurality of blades 235a and 236a are installed on the outer circumferential surface of the base steel sheet member 20 which is guided by the guide rollers 232 so as to be adjacent to the upper and lower sides of the base steel sheet member 20, First and second rotary rolls 235 and 236 are provided. The wings 235a and 236a of the first and second rotary rolls 235 and 236 are subjected to a special metal treatment at their ends and are rotated at a rotational angle that is not perpendicular to the center of the first and second rotary rolls 235 and 236 And is bent at a predetermined angle in a direction opposite to the direction of the arrow. This is to allow the sanding particles to hit intensely on the steel plate surface while receiving the falling sanding particles.

A sanding particle feeder 237 (FIG. 23) for feeding the sanding particles in the lower part of the chamber 231 to the first and second rotary rolls 235 and 236 is provided on the side adjacent to the first and second rotary rolls 235 and 236 238 are installed. The sanding particle feeders 237 and 238 are not shown in the drawings, but may further include a selected one of a bucket elevator, an air pump, and a screw feeder.

The sanding particles are used to strike the surface of the base steel sheet member 20 to form irregular protrusions and recesses and to remove foreign matter. Brownian aluminum oxide having a grain size of 1000 mu m to 2000 mu m can be used.

Meanwhile, the surface treatment unit 230 is not limited to the above-described embodiment, and an air compression spraying method in which sanding particles are piled up in the air sprayed at a high pressure can be applied.

The surface treatment unit 230 configured as described above supplies the sending particles to the first and second rotary rolls 235 and 236 rotating at a high speed by the supplied granular feeders 237 and 238, The sanding particles are caused to collide with the upper and lower surfaces of the base steel sheet member 20 by the blades 235a and 236a of the first and second rotary rolls 235 and 236 so that the bonding surface 21 of the base steel sheet member 20, The surface irregularities of various shapes can be formed.

The cleaning unit 240 is for cleaning both surfaces of the base steel sheet member 20 subjected to the surface treatment and is provided on the side adjacent to the surface treatment unit 230 and is made of a base steel sheet member 20 241 and 242 which are installed on upper and lower sides of the compressed air distribution case 241 and 242 for spraying high pressure air, and a clean chamber 243 enclosing the compressed air split events 241 and 242.

The compressed air split events 241 and 242 may be symmetrically paired to form at least two pairs of the compressed air split events 241 and 242 at the upper end of the base material sheet member 20. In addition, the compressed air split events 241 and 242 can be configured so that the upper, lower, front and back angular positions and the like are attached to a fixed table (not shown) having an adjustable function. It is preferable that the pressure of compressed air injected in the compressed air split events 241 and 242 is 6 kg / cm 2 to 10 kg / cm 2.

 The foreign matter to be removed by the compressed air injected from the compressed air fraction events 241 and 242 of the cleaning unit 240 is removed by colliding with the bonding surface of the base material plate member 20 can be collected by a separate dust collector.

The base material steel sheet conveyance control unit 250 is capable of adjusting the conveyance force of the base material steel sheet member 20 and includes three conveyance rollers 251, 252 and 253 which are arranged at a triangular position to which a tension force is applied do. The first conveying roll 251 and the second conveying roll 252 of the base material steel sheet conveying control unit 250 are positioned lower or upper than the third conveying roll 253 located at the center of the first conveying roll 251 and the second conveying roll 252, It is preferable that the steel plate material be conveyed constantly while preventing warpage of the steel plate. Preferably, hydraulic cylinders are mounted on both ends of the first and second transport rolls 251 and 252, respectively, although not shown in the figure, and hydraulic pressure of 100 kg / cm 2 to 150 kg / cm 2 is applied, So that the base steel plate member can be guided to proceed constantly.

 According to the present invention, the third conveying roll 253 positioned above the first and second conveying rolls 251 and 252 is positioned at the upper side of the base steel plate member 20 passing through the second conveying roll 252 (251) and (252) so as to maintain the tension force of the steel sheet conveyed by the rotation of the process rolling rolls while passing between the pair of process rolling rolls, The position of the third feeding roll 253 can be adjusted so as to be adjustable up and down so that the tension force is maintained. That is, the third conveying rolls 253 are arranged such that the intervals between the first and second conveying rolls 251 and 252 located at the lower and left sides of the third conveying rolls 253 are adjusted so that the repulsive force It is possible to continuously perform the function of maintaining the tension force of the steel plate while performing the control function of the constant feed rate.

The coated steel sheet supply unit 300 includes a first and second rolling rolls 401 and 402 for joining the coated steel sheet members 30 wound in a coil shape to the base steel sheet member 20 as shown in FIG. A cover steel plate flattening unit 310 for flattening the cover steel plate member 30 which is to be uncoiled from the coil on which the cover steel plate member 30 is wound and the end of the cover steel plate member 30 which is loosely unwound from the coil A coated steel member welder 320 for welding the coated steel wave member 30 unwound from the coil supplied from the coil and the coil supplied with the coil, a coated steel plate cleaning unit 330 for cleaning the continuously supplied coated steel plate member 30, A coated steel sheet conveying control unit 340 for controlling the conveyance of the steel sheet is sequentially installed from the coil side of the coated steel sheet member. A space-ensuring roll (not shown) for securing a space for spray coating may be further provided on the surface of the coated steel sheet member fed to the rolling joining unit on the side where the feed adjusting unit 340 is adjacent. The space securing rolls may be installed on the upper side and the lower side of the first and second pressure rolls 401 and 402, respectively.

The coated steel sheet member 30 has a thickness of 0.3 mm to 2 mm and the flattening unit and the cleaning unit and the coated steel sheet conveyance adjusting unit 340 are substantially disposed between the planarization unit 210 and the cleaning unit 210 of the base metal sheet feeding unit 200. [ (240) and the base material steel sheet conveying control unit (250) have substantially the same structure, respectively, and will not be described again. A scratch roll 350 may be further provided on the side adjacent to the coated steel sheet member welder 320 to form a scratch on the surface of the coated steel sheet member 30. [ The scratch roll 350 may be formed by stacking send paper. It is possible to continuously carry out the surface roughness (30 to 200 mu m) work on the bonding surface 31 of the coated steel plate member 30 by using the scratch roll.

After the surface treatment of the coated steel sheet member, the air sprayed at the high pressure of the coated steel sheet cleaning unit 330 is cleaned in the same manner as the above-described base metal sheet member cleaning. The tension force and the conveying speed of the coated steel sheet member 30 during the feeding and feeding process of the coated steel sheet member are constituted by three rolls of the coated steel sheet member conveyance adjusting unit 340 and the same as the conveyance force adjustment of the base steel sheet member Feed is controlled in this way.

 The joint metal thermal spraying unit 500 is formed by joining the joining surface 21 of the base steel sheet member 20 and the joining surface 31 of the coated steel sheet member 30 supplied by the base steel sheet feeding unit 200 The joint surface 21 of the base steel plate member 20 and the joint surface 31 of the coated steel plate member 30 by the joint metal thermal spraying unit 500 for forming the thermal sprayed metal layer 40, The spraying is performed immediately before being rolled by the first and second rolling rolls 401 and 402.

13, the joint metal spraying unit 500 is provided on the front side of the first and second rolling rolls 401 and 402, that is, the joining surface 21 of the base steel plate member 20, 30 for forming the sprayed bonding metal layer 40 on the bonding surface 21 of the base-coated steel sheet 20 and the bonded surface 31 of the coated steel sheet 30 before the bonding surface of the first bonded metal sheet 30 is pressed Event < RTI ID = 0.0 > 510. In another embodiment, as shown in FIG. 14, the first joint metal event 510 may be installed adjacent to the first joint metal event 510, A second joint metal event 520 for forming a sprayed metal layer on the joint surface 31 of the base metal member 30 and a second joint metal event 520 for forming a sprayed metal layer on the joint surface 21 of the base metal plate member 20. [ Event 530. < / RTI > The first, second, and third joint events 510, 520, and 530 may include a plurality of different metals to form a sprayed metal layer. The sprayed metal layer formed by the second and third joint metal events 510 (520) is formed on the joint surface of the base steel sheet member 20 and the joint surface of the coated steel sheet member 30 to adjust the surface roughness 1 bonding metal layer 40 which is inspected by the event 510 for the bonded metal.

However, the present invention is not limited to the above-described embodiments, and the bonded metal thermal spraying unit 500 may be provided with at least one pair of the rear end portions of the pair of first and second rolling rolls 401 and 402, Layered clad steel sheet having the above-described structure.

The joint metal thermal spraying unit 500 can prevent the first joint metal event 510 or the first, second and third joint metal events 510, 520, and 530 from being intercepted and oxidized from the outside A clean chamber (not shown) may be included.

The formation of the thermal sprayed metal layer 40 using the bonded metal thermal spraying unit 500 configured as described above may be performed by using the first bonding metal event 510 or the first and second bonding metal event 510, A single metal wire or a metal wire of different material is supplied as the bonding metal used for the base metal sheet 530 so that the bonding surface 21 of the base steel sheet member 20 and the single bonding surface 31 of the covering steel sheet member 30 A sprayed metal layer or a composite sprayed metal layer can be selectively formed.

For example, two metal wires may be charged with opposite polarity and controlled at an infeed rate proportionally and supplied to the first, first, second and third tangential metal events 510, 520 and 530, respectively . At this time, when two metal wires meet at the contact point, the opposite polarity of the metal wire creates an arc and the wire end is continuously melted. In this case, the gas and air mixture gas is supplied at a high pressure to spray the molten metal wire, that is, the material for forming the thermal sprayed metal layer, just before the base steel sheet member 20 and the coated steel sheet member 30 are laminated to form the thermal sprayed metal layer 40 Respectively. In the metal wire thermal spray joining method, the main pressure of the gas supplied to the joint metal case is preferably 6 kg / cm 2 to 10 kg / cm 2. In addition, the temperature of the gas may be preheated to 100 ° C. to 450 ° C. or higher by mixing with the main gas, and spraying may be performed by using the gas as the supply pressure for the event for the bonding metal. The gas can be nitrogen, argon, other air mixture gas, etc. for the purpose of preventing the oxidation of the metal which is the welding material of various spraying metal. The gas is heavier than air and sinks to the lower part of the spray coating room when the wire spray coating is performed. In this case, if the air is sucked in a suction opening at the lower end of the spray coating room and mixed and reused with the main gas, the production cost of the clad steel can be reduced.

   The metal wires to be supplied to the first joint metal event 510 or the first, second and third joint metal events 510, 520, and 530 may be stainless steel, steel, aluminum, copper, Copper alloy, other mixed metal, and non-ferrous metal may be used.

That is, a single thermal spray bonding metal layer can be formed by using stainless steel as a thermal spray bonding metal material, and a single thermal spray bonding metal layer and a composite thermal spray bonding metal layer can be formed on the bonding surface of the base metal sheet member 20 21 and the joining surface 31 of the coated steel plate member 30 alternately.

If the thermal spraying metal layer has a plurality of single thermal spray bonding metal layers and one or more composite bonding metal layers when the thermal spraying 510, 520, . That is, the thermal sprayed joining metal layer 40 joining the joining surface 21 of the base steel plate member 20 to the joining surface of the coated steel plate member 30 is joined to the joining surface 21 of the base steel plate member 20, A single metal joint metal layer or a combined metal joint metal layer may be formed on the joint surface 31 of the coated steel sheet member 30 so that the joint metal layer or the combined metal joint metal layer may be formed.

Then, a single thermal spray bonding metal layer or a composite thermal spray welding metal layer is formed on the bonding surface 21 of the base metal sheet member 20 by the second bonding metal event 520, and the coated steel sheet member A single thermal spray bonding metal layer or a composite thermal spray bonding metal layer is formed on the bonding surface 31 of the first bonding metal member 30 and the first bonding metal case 510 is formed on the first and second rolling rolls 401 The sprayed bonding metal layer 40 joining the bonding surface 21 of the base metal sheet member 20 and the bonding surface 31 of the coated steel sheet member 30 is integrally formed .

As another example, the first joint metal event 510 or the first, second and third joint metal events 510, 520, and 530 may include first, second, and third joint metal for spraying metals of different materials. Unit events can have alternately arranged structures.

Since the events for the first, second, and third units are arranged alternately as described above, the thermal spraying metal layers formed by the different sprayed metals are bonded to the joint surface 21 of the base material sheet member 20 and the joint surface of the coated steel sheet member 30 A spray coating layer formed by two or more kinds of materials in the longitudinal direction is continuously formed on the joint surface so that the base steel sheet member 20 and the coated steel sheet member 30 are joined.

On the other hand, the clad steel sheet manufacturing apparatus 100 is configured to heat the base steel sheet member 20 and the coated steel sheet member 30 at a low temperature when joining the base steel sheet member 20 and the coated steel sheet member 30 using the spray coating bonding layer The heating unit may further include a heating unit. This heating unit can be composed of an electric heater installed in a spray clean room where events for joint metal are installed. At this time, it is preferable that the spray coating room is filled with a certain amount of gas so that the base steel plate member 20, the coated steel plate member 30, and the spray bonding metal layers do not undergo oxidation denaturation due to low temperature heating. In the case of preventing the low-temperature heating and oxidation as described above, it is possible to form a spray-welded metal layer more densified by the densification due to the joining of the sprayed metal, and furthermore, the rolling between the base steel plate member 20 and the coated steel plate member 30 The bonding force can be greatly improved, and the productivity can be improved. However, in the case where the material metal to be the spray-bonded metal is excellent in ductility, it is not always necessary to preheat the base steel plate member 20 and the cover steel plate member 30. [

The rolling joining unit 400 of the steel sheet manufacturing apparatus is for joining the base steel plate member 20 and the coated steel plate member 30 by pressure bonding using a spray bonding metal layer and is composed of a first rolling roll 401 The first and second rolling rolls 401 and 402 are driven by a motor, not shown in the figure, and preferably have a rolling load of 50 kg / cm 2 to 200 kg / cm 2, It may have a change depending on the characteristics and thickness of the plate material.

Further, both sides of the first and second rolling rolls 401 and 402 are further provided with first and second cover units 610 and 620 for preventing the sprayed metal layer from being formed on the surface of the roller. The first cover unit 610 includes a film 601 for preventing the thermal spraying metal layer 40 from being formed on the outer circumferential surface of the first rolling roller 401 so as to contact the outer circumferential surface of the first rolling roller 401, A winding reel 602 and a winding reel 603 winding the film 601 unwound from the film winding reel 602 to cover the outer peripheral surface of the first rolling roll. The configuration of the second cover unit 620 is substantially similar to that of the first cover unit 610. [

The first and second cover units 610 and 620 configured as described above are rotated by the first and second rolling rolls 401 and 402 to rotate the film winding member 20 and the coated steel plate member 30, The rolled film 601 from the roll 602 is wound around the first rolling roll 401 and the backing roll 603 covering the outer circumferential surfaces of the second rolling roll 402 to form the first and second rolling rolls 401 and 402 It is possible to prevent the spray coating layer from being formed on the outer circumferential surface. Further, a clad steel plate flattening unit 700 for flattening the clad steel plate in which the joining is made by bonding the base steel plate member 20 and the bulged steel plate member 30 to the rear of the rolling joining unit is further provided.

INDUSTRIAL APPLICABILITY As described above, the clad steel sheet manufacturing apparatus according to the present invention can continuously produce the clad steel sheet by joining the coated steel sheet members continuously to the surface of the base steel sheet member using the spray gun bonding layer, It is possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (19)

A method of manufacturing a base steel plate member, comprising the steps of: spraying a joining metal on a joining surface of at least one selected side of the base steel plate member and a joining surface of the coated steel plate member, And a thermal sprayed metal layer joining the coated steel sheet member,
Wherein the thermal spray bonding metal layer comprises a first sprayed metal layer that is sprayed on the bonding surface of the base steel sheet member, a second sprayed metal layer that is sprayed on the bonding surface of the coated steel sheet member, and a second sprayed metal layer that is located between the first sprayed layer and the second sprayed metal layer And at least one third thermal spray bonding metal layer for bonding the first and second sprayed metal layers to each other. The method according to claim 1,
Wherein the base steel plate member is made of iron or an iron alloy and the coated steel plate member is made of one selected from stainless steel, a stainless steel alloy, aluminum, an aluminum alloy, a copper alloy and titanium, and the material of the thermal sprayed metal layer is stainless steel, , Copper or other non-ferrous metal. delete The method according to claim 1,
Wherein the material of the third thermal sprayed metal layer is made of a material which is relatively stronger or weaker than that of the first and second thermal sprayed metal layers. The method according to claim 1,
Wherein the material forming the first and second sprayed metal layers is a mixture of at least two metals selected from stainless steel, a stainless steel alloy, carbon steel, aluminum, an aluminum alloy and copper. The method according to claim 1,
The material of the sprayed metal bonding layer formed on at least one side of the bonding surface of the base metal sheet member or the bonding surface of the coated steel sheet member is made of a mixture of at least two metals selected from stainless steel, a stainless steel alloy, carbon steel, aluminum, And a clad steel plate. The method of claim 1,
Wherein the base steel sheet member is formed by joining the first and second base steel sheet members made of a cold or hot-rolled steel sheet by a spray bonding metal layer formed by spraying a bonding metal. A base steel plate member having a tubular body portion formed by joining both end portions in the longitudinal direction thereof to form a tubular body portion; a coated steel plate member covering at least one side of the inner or outer peripheral surface of the base steel plate member; And a thermal sprayed metal layer for joining the base steel sheet member and the coated steel sheet member to the joint surface of the steel sheet member,
Wherein the thermal spray bonding metal layer comprises a first sprayed metal layer which is sprayed on the bonding surface of the base steel sheet member, a second sprayed metal layer which is sprayed on the bonding surface of the coated steel sheet member, and a second sprayed metal layer which is located between the first sprayed layer and the second sprayed layer And at least one third thermal spray bonding metal layer for bonding the first and second sprayed metal layers to each other. 9. The method of claim 8,
Wherein the base steel sheet member is made of iron or an iron alloy and the coated steel sheet member is made of one selected from the group consisting of stainless steel, a stainless steel alloy, aluminum, an aluminum alloy, a copper alloy and titanium, and the material of the sprayed metal layer is stainless steel, , Aluminum (Al), and copper (Al). delete 9. The method of claim 8,
Wherein a width of a covered steel plate member attached to the base steel plate member is relatively large and both end portions of the coated steel plate member are joined by a projected coated steel plate portion protruding from an end of the base steel plate member. . 9. The method of claim 8,
Wherein the material of the third thermal sprayed metal layer is made of a material which is relatively stronger or weaker than that of the first and second thermal sprayed metal layers. 13. The method of claim 12,
Wherein the material forming the first and second sprayed metal layers is a mixture of at least two metals selected from stainless steel, a stainless steel alloy, carbon steel, aluminum, and copper. 9. The method of claim 8,
Wherein the material of the thermal spray bonded metal layer formed on at least one side of the bonding surface of the base steel sheet member or the bonding surface of the coated steel sheet member is a mixture of at least two metals selected from stainless steel, a stainless steel alloy, carbon steel, aluminum and copper Steel pipe using clad steel. 10. The method of claim 8,
Wherein the base steel sheet member is formed by joining the first and second base steel sheet members made of a cold or hot-rolled steel sheet by a spray joint metal layer formed by spraying a joint metal of the first and second base steel sheet members.








delete delete delete delete

Images